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The white-tailed eagle (Haliaeetus albicilla) is a very large species of sea eagle widely distributed across temperate Eurasia. Like all eagles, it is a member of the family Accipitridae (or accipitrids) which includes other diurnal raptors such as hawks, kites, and harriers. One of up to eleven members in the genus Haliaeetus, which are commonly called sea eagles, it is also referred to as the white-tailed sea-eagle. Sometimes, it is known as the ern or erne (depending on spelling by sources), gray sea eagle and Eurasian sea eagle. While found across a very wide range, today breeding as far west as Greenland and Iceland across to as far east as Hokkaido, Japan, they are often scarce and very spottily distributed as a nesting species, mainly due to human activities. These have included habitat alterations and destruction of wetlands, about a hundred years of systematic persecution by humans (from the early 1800s to around World War II) followed by inadvertent poisonings and epidemics of nesting failures due to various manmade chemical pesticides and organic compounds, which have threatened eagles since roughly the 1950s and continue to be a potential concern. Due to this, the white-tailed eagle was considered endangered or extinct in several countries. However, some populations have recovered well due to some governmental protections and dedicated conservationists and naturalists protecting habitats and nesting sites and partially regulating poaching and pesticide usage, as well as careful reintroductions into parts of their former range. White-tailed eagles usually live most of the year near large bodies of open water, including both coastal saltwater areas and inland freshwater, including wetlands, lakes, bogs and rivers, and require an abundant food supply and old-growth trees or ample sea cliffs for nesting. This raptor is both a powerful apex predator and an opportunistic scavenger, mainly subsisting on fish and birds (largely water birds) amongst nearly any other available prey. They are considered a close cousin of the bald eagle (Haliaeetus leucocephalus), which occupies a similar niche in North America. This eagle breeds in northern Europe and northern Asia. Their range extends to as far west as southern Greenland (prevented from breeding further north due to the short summers), northern and western Iceland, and the reintroduced populations in some areas of England (re-established in 2019), Ireland and Scotland, particularly conserved coastal spots. In mainland Europe the range is expanding, with birds breeding in coastal and western Norway (broadly), northern and southwestern Finland, eastern Sweden, southern Denmark (and some spots in the north), islands of the Baltic Sea, western Austria, northeastern Germany, northern and eastern Poland, the Czech Republic, much of the east Baltic countries, the non-montane areas of Ukraine, eastern Slovenia, central and southern Hungary (and adjacent northeastern Croatia), very sporadically in Greece, the Danube sections of Romania and Bulgaria to the Black Sea and western and eastern Moldova. The bird returned to the Netherlands in 2006 and in 2020 the number of breeding pairs had increased to 20. In Asia Minor, it only remains as a breeder in very sparse and small pockets of Turkey and Georgia, taken as a region there is likely to be fewer than 30 breeding pairs in this region. In the Middle East, the white-tailed eagle may still be found breeding only along the southern coast of the Caspian Sea in northern Iran and southwestern Turkmenistan. Discontinuously, they are found as residents in Kazakhstan where they live in a long strip of the southern part of the country starting at the Aral Sea and the northwestern portion (but not, as far as is known, breeding in the Kazakh part of the Caspian Sea coast). The only country in which the white-tailed eagle is found over a continuous and extremely large area is Russia. The species is found very broadly everywhere in Russia from European Russia in the west to the Bering Sea in the east, only being fully absent as a nester as far as is known from the high Arctic regions and a section bordering westernmost Kazakhstan, although it breeds to south of this in the Russian coastal part of the Caspian Sea. Their northern limits occur in Russia to the Ob river to 70 degrees north at the mouth of the Yenisei River and on the Gyda and Yamal Peninsulas, to the Kolyma, Indigirka and Lena rivers to above 72 degrees north, even to 75 degrees north on the Taymyr Peninsula. They are said to be common around the White Sea, reportedly even the most abundant bird of prey locally and found both on coasts and inland lakes, although breeding rates are low due to the frigid weather. From Russia, breeding populations spill somewhat into northernmost Mongolia, extreme northwestern China and northern North Korea. The white-tailed eagle also breeds on Sakhalin Island, the Kuril Islands and Hokkaido, the northernmost island of Japan.
